Attachment for hydraulic systems



F. J. DAVIS.

ATTACHMENT FOR HYDRAULIC SYSTEMS.

APPLICATION FILED MAY 2. 1918.

1,306,582. PatentedJunelOJQTQ.

W/ TIT/E8858 v I IN l/E N TOR {gr-W 6 ATTORNEYS FRANK J. DAVIS, OZE SAN FRANCISCO, CALIFORNIA.

ATTACHMENT FOR HYDRAULIC SYSTEMS.

Specification of Letters Patent. Patented J 11119 10, 1919.

Application filed May 2, 1918. Serial No. 232,095.

To all whom it may concern Be it known that I, FRANK J. DAvIs, a citizen of the United States, and a resident of San Francisco, in the county of San Francisco and State of California, have invented a new and Improved Attachment for Hydraulic Systems, of which the following is a description.-

My invention, while adapted for use generally in connection with hydraulic systems, is more particularly designed for use with what is known as the telemotor, largely employed as operating gear for marine steering engines, and in which accumulation of ai results in lost motion in the operation of the steering gear with a consequent improper working of the rudder.

The invention especially relates to a means adapted to be installed in the hydraulic system at the highest point thereof, to vent accumulated air and to admit liquid to the system from an extraneous supply provided in connection with the attachment.

An object of the invention is to provide a valve controlling the escape of accumulated air and normally maintained closed by the liquid in the hydraulic system but adapted to automatically open by the-presence of an air pocket at the valve.

A further object of the invention is to provide an air vent valve so arranged as to admit liquid to the same as the valve is vented, whereby to restore a liquid control of the valve for closing the same after the venting action.

An object of the invention also is to provide a venting and liquid supplying attachment that may be applied to the system in lieu of a closing plug now employed in a head forming part of the hydraulic system for which the attachment is particularly designed.

Reference is to be had to the accompanying drawings forming a part of this specification, it being understood that the drawings are merely illustrative of one example of the invention.

Figure 1 is a sectional side elevation of my to constitute the base of the valve casing employed in my attachment; 7

Flg. Al is a partly sectional side elevation of a float valve forming part of the attachment; Y

Fig. 5 is a plan view of the valve shown in Fig. 2.

The illustrated practical embodiment of my invention includes a fitting 10 having a threaded nipple 10 adapted to be fitted to the head A forming part of the hydraulic system at the highest point thereof, said fitting having a vertical throughbore l1. Threaded on to the upper end of the fitting 10 is a valve casing 1.2 connected with the upper portion of which'is a lateral pipe 13 which communicates with a tank 14: near the bottom of the latter. The tank 1a is adapted to contain a supply of liquid, whereby to admit a quantity of liquid therefrom to the valve casing 12. In the casing 12 is a float 15 carrying at the top thereof a valve 16 adapted to seat on the valve seat 17 at the base of a vertical port 18 in the casing 12, the upper end of the port communicating with the chamber 12 in the valve casing to which the pipe 13 leads from the tank 14. Secured to and extending upwardly from valve 17 is a guide stem 19 having lateral wings fitting the vertical port 18 and permitting the flow of air o liquid along said stem. The float 15 when in the lowered position is adapted to rest on raised projections 20 on the top of the fitting 10 within the casing 12, there being lateral passages 21 between said projections to maintain free communication between the interior of the valve casing and the bore 11 of the fitting 10.

By reason of the bore 11 the interior of the valve casing which forms the float chamber for the float 15, is always in communication with the hydraulic system through the head A thereof, so that under normal fluid conditions in the system the liquid in the latter will maintain the float 15 with the valve 17 closed. The formation of an air pocket, however, in the head A and hence in the float chamber of the valve casing, will permit the float to drop by the weight of said float and its valve thereby venting the casing and permitting accumulated air to escape through the port 18, chamber 12 and pipe 13 to the tank 14. Thus, at the same time liquid will flow gravitationally from the tank 14 to the pipe 13 to the float chamber so that upon restoration of the normal liquid conditions in the system and hence in the head A, the float will rise and close the valve 17.

A shut-ofi' valve 22 is provided, adapted to seat within the casing 12 at the upper end of the port 18. The stem 23 of said valve extends upwardly through the top of the casing and is provided with a handwheel or like turning means. The valve stem extends through and has threaded connection with a nut 25 and lock nut 26 above the casing 10, a suitable packing 27 being employed between said nuts.

I would state in conclusion that while the illustrated example constitutes a practical embodiment of my invention, I do not limit myself strictly to the mechanical details herein illustrated, since manifestly the same can be considerably varied without departure from the spirit of the invention as defined in the appended claim.

Having thus described my invention, I claim as new, and desire to secure by Letters Patent:

An attachment of the class described including a valve casing adapted to be con nected with a hydraulic system to receive liquid from the latter under normal fluid conditions therein, a liquid supply tank elevated above the casing and connected therewith to gravitation-ally supply liquid there to, a float in said casing, a valve mounted on said float, said valve controlling the escape of air from the valve casing to the tank and the flow of liquid from the tank to the casing; together with a shut-oil valve between the valve casing and the tank.

FRANK J DAVIS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). G. 

